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ECS chpt 3.1 & 3.2
Erosion and Deposition
| Term | Definition |
|---|---|
| mass movement | The process of moving sediment downhill. ex: landslides, mudflow, slump, creep |
| sediment | The material moved by erosion |
| deposition | The process by which sediment is "laid down" or deposited on Earth's surface. |
| erosion | The process by which sediment is moved or carried from one place to another. |
| rill | Tiny grooves made from flowing water; often caused by runoff created by rainfall. |
| gully | A larger groove made by joining rills; water dries up after rainfall stops. |
| runoff | Water that flows over Earth's surface when rainfall is too fast and sudden to be soaked up or evaporated. |
| stream | A small channel where water is continuously flowing; it doesn't dry up after rainfall stops. |
| tributary | A stream or river that flows into a larger stream or river. |
| drainage basin | The area of land from which a river gets its water. Also called a watershed (Upstream) |
| river | A large stream |
| divide | The high ground between two drainage basins |
| flood plain | A wide valley where a river flows; this area floods during heavy rainfall. |
| meander | a loop-like bend in the course of a river |
| oxbow lake | A meander that has been cut off from the river |
| alluvial fan | Wide sloping deposit of sediment formed where a stream leaves a steep mountain range; fan-shaped |
| delta | A landform formed when sediment is deposited at the mouth of a river. |
| groundwater | Underground water; soaked into the ground and fills cracks in layers of rock below the surface. |